The invention relates to a filtration and separation process and device for soil for agricultural planting. The filtration and separation device comprises a material crushing container, a feeding container is connected to the upper portion of the material crushing container, a left power mechanism and a right power mechanism are arranged on the left side and the right side of the material crushingcontainer correspondingly, a left mashing rotating mechanism and a right mashing rotating mechanism are arranged on the left side and the right side of the interior of the material crushing containercorrespondingly, a material returning pipe is connected to the lower portion of the left side of the material crushing container, the left side of the material returning pipe is connected with a material collecting container, the lower portion of the material crushing container is provided with a separation mechanism, the lower portion of the separation mechanism is provided with a material discharging container, the right side of the material discharging container is connected with a lifting container, the upper portion of the lifting container is provided with an upper power mechanism, thelower portion of the upper power mechanism is connected with a power mechanism shaft, the side surface of the power mechanism shaft is provided with a stirring mechanism, and the upper portion of theright side of the lifting container is connected with a feeding pipe. According to the filtration and separation process and device, the system can be used for effectively filtering and separating soil for agricultural planting, moreover, distribution use is facilitated, so that agricultural planting use are facilitated, and the growth effect of agricultural plants is improved.